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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d775f840d62de237436cf3cc00d8193bf8353326f31335189ad0745ac1ddcd' 
  AND token = 'B/46+RPFOpwV/32MBeAaSBqR/KK1Sp8wgpNya8rgZSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}